to repeat / to double / to overlap / complex (not simple) / compound / composite / double / diplo- / duplicate / overlapping / to duplicate
复
=
𠂉
+
日
+
夂
:
Mnemonic symbol: a photocopier.
Frieda Fox (fu) and the sun (日) have to wear high heels (夂) in the space station's bathroom (Ø4). The high heels are locked, and they only have one key (𠂉). They know that the key is very fragile and can only be used once, so they use a photocopier (复) to create more keys so that both of them can be freed.